Importance

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Abstract

A method for compensating a timing offset in calibration of AC (alternating current) voltage level switching in a relay and a computer program product thereof are introduced. The method involves performing timing detection of electrical connection/disconnection of the relay at a zero-voltage crossing point by a controlling unit and detecting circuits disposed at input and output ends of the relay, respectively, calculating a timing offset compensation value according to a temporal difference between a point in time of the switching of the relay and the zero-voltage crossing point, and obtaining an accurate response time of the relay to electrical connection/disconnection thereof according to the timing offset compensation value, such that the electrical disconnection/connection of the relay calibrated by the controlling unit coincides with the zero-voltage crossing point to avoid instantaneous high current charging and preclude a spark which is likely to end up in electrical disconnection.

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First Claim